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          <a href="./CPAN::Meta::Requirements.html">CPAN::Meta::Requirements</a>
          <div id="more">
            (<a href="./CPAN::Meta::Requirements.txt">source</a>,
            <a href="https://metacpan.org/pod/CPAN::Meta::Requirements">CPAN</a>)
          </div>
            <div id="moduleversion">version 2.140</div>
        </div>
        <div class="leading-notice">
          You are viewing the version of this documentation from Perl 5.35.0.
            This is a development version of Perl.
        </div>
        <h1><a id="toc">CONTENTS</a></h1>
                  <ul>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#NAME">NAME</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#VERSION">VERSION</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#SYNOPSIS">SYNOPSIS</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#DESCRIPTION">DESCRIPTION</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#METHODS">METHODS</a>
                            <ul>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#new">new</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#add_minimum">add_minimum</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#add_maximum">add_maximum</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#add_exclusion">add_exclusion</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#exact_version">exact_version</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#add_requirements">add_requirements</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#accepts_module">accepts_module</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#clear_requirement">clear_requirement</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#requirements_for_module">requirements_for_module</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#structured_requirements_for_module">structured_requirements_for_module</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#required_modules">required_modules</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#clone">clone</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#is_simple">is_simple</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#is_finalized">is_finalized</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#finalize">finalize</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#as_string_hash">as_string_hash</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#add_string_requirement">add_string_requirement</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#from_string_hash">from_string_hash</a>
              </li>
          </ul>

              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#SUPPORT">SUPPORT</a>
                            <ul>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#Bugs-/-Feature-Requests">Bugs / Feature Requests</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#Source-Code">Source Code</a>
              </li>
          </ul>

              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#AUTHORS">AUTHORS</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#CONTRIBUTORS">CONTRIBUTORS</a>
              </li>
              <li>
                <a class="text-decoration-none" href="./CPAN::Meta::Requirements.html#COPYRIGHT-AND-LICENSE">COPYRIGHT AND LICENSE</a>
              </li>
          </ul>

      <h1 id="NAME"><a class="permalink" href="./CPAN::Meta::Requirements.html#NAME">#</a>NAME</h1>

<p>CPAN::Meta::Requirements - a set of version requirements for a CPAN dist</p>

<h1 id="VERSION"><a class="permalink" href="./CPAN::Meta::Requirements.html#VERSION">#</a>VERSION</h1>

<p>version 2.140</p>

<h1 id="SYNOPSIS"><a class="permalink" href="./CPAN::Meta::Requirements.html#SYNOPSIS">#</a>SYNOPSIS</h1>

<pre><code>use CPAN::Meta::Requirements;

my $build_requires = CPAN::Meta::Requirements-&gt;new;

$build_requires-&gt;add_minimum(&#39;Library::Foo&#39; =&gt; 1.208);

$build_requires-&gt;add_minimum(&#39;Library::Foo&#39; =&gt; 2.602);

$build_requires-&gt;add_minimum(&#39;Module::Bar&#39;  =&gt; &#39;v1.2.3&#39;);

$METAyml-&gt;{build_requires} = $build_requires-&gt;as_string_hash;</code></pre>

<h1 id="DESCRIPTION"><a class="permalink" href="./CPAN::Meta::Requirements.html#DESCRIPTION">#</a>DESCRIPTION</h1>

<p>A CPAN::Meta::Requirements object models a set of version constraints like those specified in the <i>META.yml</i> or <i>META.json</i> files in CPAN distributions, and as defined by <a href="./CPAN::Meta::Spec.html">CPAN::Meta::Spec</a>; It can be built up by adding more and more constraints, and it will reduce them to the simplest representation.</p>

<p>Logically impossible constraints will be identified immediately by thrown exceptions.</p>

<h1 id="METHODS"><a class="permalink" href="./CPAN::Meta::Requirements.html#METHODS">#</a>METHODS</h1>

<h2 id="new"><a class="permalink" href="./CPAN::Meta::Requirements.html#new">#</a>new</h2>

<pre><code>my $req = CPAN::Meta::Requirements-&gt;new;</code></pre>

<p>This returns a new CPAN::Meta::Requirements object. It takes an optional hash reference argument. Currently, only one key is supported:</p>

<ul>

<li><p><code>bad_version_hook</code> -- if provided, when a version cannot be parsed into a version object, this code reference will be called with the invalid version string as first argument, and the module name as second argument. It must return a valid version object.</p>

</li>
</ul>

<p>All other keys are ignored.</p>

<h2 id="add_minimum"><a class="permalink" href="./CPAN::Meta::Requirements.html#add_minimum">#</a>add_minimum</h2>

<pre><code>$req-&gt;add_minimum( $module =&gt; $version );</code></pre>

<p>This adds a new minimum version requirement. If the new requirement is redundant to the existing specification, this has no effect.</p>

<p>Minimum requirements are inclusive. <code>$version</code> is required, along with any greater version number.</p>

<p>This method returns the requirements object.</p>

<h2 id="add_maximum"><a class="permalink" href="./CPAN::Meta::Requirements.html#add_maximum">#</a>add_maximum</h2>

<pre><code>$req-&gt;add_maximum( $module =&gt; $version );</code></pre>

<p>This adds a new maximum version requirement. If the new requirement is redundant to the existing specification, this has no effect.</p>

<p>Maximum requirements are inclusive. No version strictly greater than the given version is allowed.</p>

<p>This method returns the requirements object.</p>

<h2 id="add_exclusion"><a class="permalink" href="./CPAN::Meta::Requirements.html#add_exclusion">#</a>add_exclusion</h2>

<pre><code>$req-&gt;add_exclusion( $module =&gt; $version );</code></pre>

<p>This adds a new excluded version. For example, you might use these three method calls:</p>

<pre><code>$req-&gt;add_minimum( $module =&gt; &#39;1.00&#39; );
$req-&gt;add_maximum( $module =&gt; &#39;1.82&#39; );

$req-&gt;add_exclusion( $module =&gt; &#39;1.75&#39; );</code></pre>

<p>Any version between 1.00 and 1.82 inclusive would be acceptable, except for 1.75.</p>

<p>This method returns the requirements object.</p>

<h2 id="exact_version"><a class="permalink" href="./CPAN::Meta::Requirements.html#exact_version">#</a>exact_version</h2>

<pre><code>$req-&gt;exact_version( $module =&gt; $version );</code></pre>

<p>This sets the version required for the given module to <i>exactly</i> the given version. No other version would be considered acceptable.</p>

<p>This method returns the requirements object.</p>

<h2 id="add_requirements"><a class="permalink" href="./CPAN::Meta::Requirements.html#add_requirements">#</a>add_requirements</h2>

<pre><code>$req-&gt;add_requirements( $another_req_object );</code></pre>

<p>This method adds all the requirements in the given CPAN::Meta::Requirements object to the requirements object on which it was called. If there are any conflicts, an exception is thrown.</p>

<p>This method returns the requirements object.</p>

<h2 id="accepts_module"><a class="permalink" href="./CPAN::Meta::Requirements.html#accepts_module">#</a>accepts_module</h2>

<pre><code>my $bool = $req-&gt;accepts_module($module =&gt; $version);</code></pre>

<p>Given an module and version, this method returns true if the version specification for the module accepts the provided version. In other words, given:</p>

<pre><code class="plaintext">Module =&gt; &#39;&gt;= 1.00, &lt; 2.00&#39;</code></pre>

<p>We will accept 1.00 and 1.75 but not 0.50 or 2.00.</p>

<p>For modules that do not appear in the requirements, this method will return true.</p>

<h2 id="clear_requirement"><a class="permalink" href="./CPAN::Meta::Requirements.html#clear_requirement">#</a>clear_requirement</h2>

<pre><code>$req-&gt;clear_requirement( $module );</code></pre>

<p>This removes the requirement for a given module from the object.</p>

<p>This method returns the requirements object.</p>

<h2 id="requirements_for_module"><a class="permalink" href="./CPAN::Meta::Requirements.html#requirements_for_module">#</a>requirements_for_module</h2>

<pre><code>$req-&gt;requirements_for_module( $module );</code></pre>

<p>This returns a string containing the version requirements for a given module in the format described in <a href="./CPAN::Meta::Spec.html">CPAN::Meta::Spec</a> or undef if the given module has no requirements. This should only be used for informational purposes such as error messages and should not be interpreted or used for comparison (see <a href="./CPAN::Meta::Requirements.html#accepts_module">&quot;accepts_module&quot;</a> instead).</p>

<h2 id="structured_requirements_for_module"><a class="permalink" href="./CPAN::Meta::Requirements.html#structured_requirements_for_module">#</a>structured_requirements_for_module</h2>

<pre><code>$req-&gt;structured_requirements_for_module( $module );</code></pre>

<p>This returns a data structure containing the version requirements for a given module or undef if the given module has no requirements. This should not be used for version checks (see <a href="./CPAN::Meta::Requirements.html#accepts_module">&quot;accepts_module&quot;</a> instead).</p>

<p>Added in version 2.134.</p>

<h2 id="required_modules"><a class="permalink" href="./CPAN::Meta::Requirements.html#required_modules">#</a>required_modules</h2>

<p>This method returns a list of all the modules for which requirements have been specified.</p>

<h2 id="clone"><a class="permalink" href="./CPAN::Meta::Requirements.html#clone">#</a>clone</h2>

<pre><code>$req-&gt;clone;</code></pre>

<p>This method returns a clone of the invocant. The clone and the original object can then be changed independent of one another.</p>

<h2 id="is_simple"><a class="permalink" href="./CPAN::Meta::Requirements.html#is_simple">#</a>is_simple</h2>

<p>This method returns true if and only if all requirements are inclusive minimums -- that is, if their string expression is just the version number.</p>

<h2 id="is_finalized"><a class="permalink" href="./CPAN::Meta::Requirements.html#is_finalized">#</a>is_finalized</h2>

<p>This method returns true if the requirements have been finalized by having the <code>finalize</code> method called on them.</p>

<h2 id="finalize"><a class="permalink" href="./CPAN::Meta::Requirements.html#finalize">#</a>finalize</h2>

<p>This method marks the requirements finalized. Subsequent attempts to change the requirements will be fatal, <i>if</i> they would result in a change. If they would not alter the requirements, they have no effect.</p>

<p>If a finalized set of requirements is cloned, the cloned requirements are not also finalized.</p>

<h2 id="as_string_hash"><a class="permalink" href="./CPAN::Meta::Requirements.html#as_string_hash">#</a>as_string_hash</h2>

<p>This returns a reference to a hash describing the requirements using the strings in the <a href="./CPAN::Meta::Spec.html">CPAN::Meta::Spec</a> specification.</p>

<p>For example after the following program:</p>

<pre><code>my $req = CPAN::Meta::Requirements-&gt;new;

$req-&gt;add_minimum(&#39;CPAN::Meta::Requirements&#39; =&gt; 0.102);

$req-&gt;add_minimum(&#39;Library::Foo&#39; =&gt; 1.208);

$req-&gt;add_maximum(&#39;Library::Foo&#39; =&gt; 2.602);

$req-&gt;add_minimum(&#39;Module::Bar&#39;  =&gt; &#39;v1.2.3&#39;);

$req-&gt;add_exclusion(&#39;Module::Bar&#39;  =&gt; &#39;v1.2.8&#39;);

$req-&gt;exact_version(&#39;Xyzzy&#39;  =&gt; &#39;6.01&#39;);

my $hashref = $req-&gt;as_string_hash;</code></pre>

<p><code>$hashref</code> would contain:</p>

<pre><code>{
  &#39;CPAN::Meta::Requirements&#39; =&gt; &#39;0.102&#39;,
  &#39;Library::Foo&#39; =&gt; &#39;&gt;= 1.208, &lt;= 2.206&#39;,
  &#39;Module::Bar&#39;  =&gt; &#39;&gt;= v1.2.3, != v1.2.8&#39;,
  &#39;Xyzzy&#39;        =&gt; &#39;== 6.01&#39;,
}</code></pre>

<h2 id="add_string_requirement"><a class="permalink" href="./CPAN::Meta::Requirements.html#add_string_requirement">#</a>add_string_requirement</h2>

<pre><code>$req-&gt;add_string_requirement(&#39;Library::Foo&#39; =&gt; &#39;&gt;= 1.208, &lt;= 2.206&#39;);
$req-&gt;add_string_requirement(&#39;Library::Foo&#39; =&gt; v1.208);</code></pre>

<p>This method parses the passed in string and adds the appropriate requirement for the given module. A version can be a Perl &quot;v-string&quot;. It understands version ranges as described in the <a href="./CPAN::Meta::Spec.html#Version-Ranges">&quot;Version Ranges&quot; in CPAN::Meta::Spec</a>. For example:</p>

<dl>

<dt id="1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#1.3">#</a><a id="1"></a><a id="pod1.3"></a>1.3</dt>
<dd>

</dd>
<dt id="&gt;=-1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#%3E=-1.3">#</a><a id="pod-1.3"></a>&gt;= 1.3</dt>
<dd>

</dd>
<dt id="&lt;=-1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#%3C=-1.3">#</a><a id="pod-1.31"></a>&lt;= 1.3</dt>
<dd>

</dd>
<dt id="==-1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#==-1.3">#</a><a id="pod-1.32"></a>== 1.3</dt>
<dd>

</dd>
<dt id="!=-1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#!=-1.3">#</a><a id="pod-1.33"></a>!= 1.3</dt>
<dd>

</dd>
<dt id="&gt;-1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#%3E-1.3">#</a><a id="pod1.31"></a>&gt; 1.3</dt>
<dd>

</dd>
<dt id="&lt;-1.3"><a class="permalink" href="./CPAN::Meta::Requirements.html#%3C-1.3">#</a><a id="pod1.32"></a>&lt; 1.3</dt>
<dd>

</dd>
<dt id="&gt;=-1.3,-!=-1.5,-&lt;=-2.0"><a class="permalink" href="./CPAN::Meta::Requirements.html#%3E=-1.3,-!=-1.5,-%3C=-2.0">#</a><a id="pod-1.3-1.5-2.0"></a>&gt;= 1.3, != 1.5, &lt;= 2.0</dt>
<dd>

<p>A version number without an operator is equivalent to specifying a minimum (<code>&gt;=</code>). Extra whitespace is allowed.</p>

</dd>
</dl>

<h2 id="from_string_hash"><a class="permalink" href="./CPAN::Meta::Requirements.html#from_string_hash">#</a>from_string_hash</h2>

<pre><code>my $req = CPAN::Meta::Requirements-&gt;from_string_hash( \%hash );
my $req = CPAN::Meta::Requirements-&gt;from_string_hash( \%hash, \%opts );</code></pre>

<p>This is an alternate constructor for a CPAN::Meta::Requirements object. It takes a hash of module names and version requirement strings and returns a new CPAN::Meta::Requirements object. As with add_string_requirement, a version can be a Perl &quot;v-string&quot;. Optionally, you can supply a hash-reference of options, exactly as with the <a href="./CPAN::Meta::Requirements.html#new">&quot;new&quot;</a> method.</p>

<h1 id="SUPPORT"><a class="permalink" href="./CPAN::Meta::Requirements.html#SUPPORT">#</a>SUPPORT</h1>

<h2 id="Bugs-/-Feature-Requests"><a class="permalink" href="./CPAN::Meta::Requirements.html#Bugs-/-Feature-Requests">#</a><a id="Bugs"></a><a id="Bugs-Feature-Requests"></a>Bugs / Feature Requests</h2>

<p>Please report any bugs or feature requests through the issue tracker at <a href="https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements/issues">https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements/issues</a>. You will be notified automatically of any progress on your issue.</p>

<h2 id="Source-Code"><a class="permalink" href="./CPAN::Meta::Requirements.html#Source-Code">#</a><a id="Source"></a>Source Code</h2>

<p>This is open source software. The code repository is available for public review and contribution under the terms of the license.</p>

<p><a href="https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements">https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements</a></p>

<pre><code class="plaintext">git clone https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements.git</code></pre>

<h1 id="AUTHORS"><a class="permalink" href="./CPAN::Meta::Requirements.html#AUTHORS">#</a>AUTHORS</h1>

<ul>

<li><p>David Golden &lt;dagolden@cpan.org&gt;</p>

</li>
<li><p>Ricardo Signes &lt;rjbs@cpan.org&gt;</p>

</li>
</ul>

<h1 id="CONTRIBUTORS"><a class="permalink" href="./CPAN::Meta::Requirements.html#CONTRIBUTORS">#</a>CONTRIBUTORS</h1>

<ul>

<li><p>Ed J &lt;mohawk2@users.noreply.github.com&gt;</p>

</li>
<li><p>Karen Etheridge &lt;ether@cpan.org&gt;</p>

</li>
<li><p>Leon Timmermans &lt;fawaka@gmail.com&gt;</p>

</li>
<li><p>robario &lt;webmaster@robario.com&gt;</p>

</li>
</ul>

<h1 id="COPYRIGHT-AND-LICENSE"><a class="permalink" href="./CPAN::Meta::Requirements.html#COPYRIGHT-AND-LICENSE">#</a><a id="COPYRIGHT"></a>COPYRIGHT AND LICENSE</h1>

<p>This software is copyright (c) 2010 by David Golden and Ricardo Signes.</p>

<p>This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.</p>


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